St. John Henry Newman’s name was invoked during the recent Synod on Synodality to justify a heterodox “development of doctrine.” But in “The Infidelity of the Future,” one of Newman’s most well-remembered sermons, in which he foresaw a coming age of inconstancy and “unbelief.” On the other hand, “Consistency, completeness, is a persuasive argument for a system being true. Certainly if it be inconsistent, it is not truth.”